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diff --git a/.clang-format b/.clang-format
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+++ b/.clang-format
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+---
+Language: Cpp
+BasedOnStyle: Chromium
+
+IndentWidth: 4
+...
diff --git a/.gitattributes b/.gitattributes
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+++ b/.gitattributes
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+* text=auto
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
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+++ b/.github/workflows/test.yml
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+name: Test
+
+on:
+  push:
+  pull_request:
+  schedule:
+    # Weekly, at 5:45 AM on Friday (somewhat randomly chosen).
+    - cron: '45 5 * * 5'
+  workflow_dispatch:
+
+jobs:
+  old_and_new:
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        version: [10, 11]
+        style: [file, Chromium]
+        include:
+          - {style: file, exclude: test/chromium.cpp}
+          - {style: Chromium, exclude: test/file.cpp}
+
+    runs-on: '${{ matrix.os }}'
+
+    name: '${{ matrix.os }} / ${{ matrix.version }} / ${{ matrix.style }}'
+
+    defaults:
+      run:
+        shell: pwsh
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: clang-format (success)
+        uses: ./
+        with:
+          version: '${{ matrix.version }}'
+          style: '${{ matrix.style }}'
+          exclude: '${{ matrix.exclude }}'
+
+      - id: diff
+        name: clang-format (fail)
+        uses: ./
+        with:
+          version: '${{ matrix.version }}'
+          style: '${{ matrix.style }}'
+        continue-on-error: true
+
+      - name: Verify diff
+        run: |
+          $output = '${{ steps.diff.outputs.diff }}'
+          $basename = Split-Path '${{ matrix.exclude }}' -Leaf
+          $original  = "$basename (original)"
+          $formatted = "$basename (formatted)"
+          $output.Contains($original)  -or $(throw "Diff should contain: $original")
+          $output.Contains($formatted) -or $(throw "Diff should contain: $formatted")
diff --git a/LICENSE.txt b/LICENSE.txt
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+++ b/LICENSE.txt
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2021 Egor Tensin <Egor.Tensin@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/README.md b/README.md
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+++ b/README.md
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+clang-format
+============
+
+[![Test](https://github.com/egor-tensin/clang-format/actions/workflows/test.yml/badge.svg)](https://github.com/egor-tensin/clang-format/actions/workflows/test.yml)
+
+This GitHub action runs `clang-format` on your C/C++ source files and shows the
+diff.
+
+Use it in your workflow like this:
+
+    - name: clang-format
+      uses: egor-tensin/clang-format@v1
+
+API
+---
+
+| Input   | Value   | Default | Description
+| ------- | ------- | ------- | -----------
+| version | *empty* | ✓       | Use `clang-format`.
+|         | *any*   |         | Use `clang-format-VERSION`.
+| style   | file    | ✓       | Use .clang-format.
+|         | *any*   |         | `-style=STYLE` (Microsoft, LLVM, etc.).
+| exclude | *empty* | ✓       | Don't exclude any files.
+|         | *any*   |         | List of files and directories to exclude, separated by a colon `:`.
+
+| Output | Description
+| ------ | -----------
+| diff   | Diff between the original and the properly formatted files.
+
+License
+-------
+
+Distributed under the MIT License.
+See [LICENSE.txt] for details.
+
+[LICENSE.txt]: LICENSE.txt
diff --git a/action.yml b/action.yml
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index 0000000..790f2a9
--- /dev/null
+++ b/action.yml
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+name: clang-format (w/ diff)
+description: clang-format all C/C++ files in the project, and show the diff
+
+inputs:
+  version:
+    description: clang-format version
+    required: false
+  style:
+    description: clang-format -style parameter value
+    required: false
+    default: file
+  exclude:
+    description: ':-separated list of excluded files and directories'
+    required: false
+outputs:
+  diff:
+    description: diff between the actual and the formatted code
+    value: '${{ steps.run.outputs.diff }}'
+
+runs:
+  using: composite
+  steps:
+    - id: run
+      run: |
+        New-Variable version -Value '${{ inputs.version }}' -Option Constant
+        New-Variable style -Value '${{ inputs.style }}' -Option Constant
+        New-Variable exclude -Value '${{ inputs.exclude }}' -Option Constant
+
+        if (Get-Command python3 -ErrorAction SilentlyContinue) {
+            $python = @('python3')
+        } elseif (Get-Command py -ErrorAction SilentlyContinue) {
+            $python = @('py', '-3')
+        } elseif (Get-Command python -ErrorAction SilentlyContinue) {
+            $python = @('python')
+        } else {
+            echo @'
+        ::error ::
+        egor-tensin/clang-format uses a Python script, which requires Python 3.6 or later.
+        We couldn't find a Python installation in this environment.
+        '@
+            exit 1
+        }
+
+        $cmake_common_version = 'v3.2'
+        $script_name = 'project-clang-format.py'
+        $script_path = Join-Path '${{ github.workspace }}' .. $script_name
+        $download_url = "https://raw.githubusercontent.com/egor-tensin/cmake-common/$cmake_common_version/tools/$script_name"
+
+        $ProgressPreference = 'SilentlyContinue'
+        Invoke-WebRequest $download_url -OutFile $script_path
+
+        $clang_format = 'clang-format'
+        if ($version) {
+            $clang_format += "-$version"
+        }
+
+        $exclude_list = $exclude.Split(':', [System.StringSplitOptions]::RemoveEmptyEntries)
+        if ($exclude_list) {
+            $exclude_list = ,'--exclude' + $exclude_list
+        }
+
+        $exe, $args = $python
+        $output = & $exe $args $script_path --clang-format $clang_format --style $style $exclude_list | Out-String
+
+        $output = $output.TrimEnd("`n")
+        $output = $output.TrimEnd("`r")
+        Write-Output $output
+
+        # If anyone thinks this workaround is anything but complete batshit
+        # insanity, they should just fucking kill themselves.
+        # https://github.community/t/set-output-truncates-multiline-strings/16852/3
+        $output = $output.replace('%', '%25')
+        $output = $output.replace("`n", '%0A')
+        $output = $output.replace("`r", '%0D')
+
+        Write-Output "::set-output name=diff::$output"
+      shell: pwsh
diff --git a/test/chromium.cpp b/test/chromium.cpp
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index 0000000..c2b0e40
--- /dev/null
+++ b/test/chromium.cpp
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+int a() {
+  return 42;
+}
diff --git a/test/file.cpp b/test/file.cpp
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index 0000000..548ff67
--- /dev/null
+++ b/test/file.cpp
@@ -0,0 +1,3 @@
+int b() {
+    return 42;
+}